<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <input type="text" class="box" value="123">
    <input type="checkbox" class="boxx">
    <script>
        const inp = document.querySelector('input[value]') //类选择器
        console.log(inp);
        console.log(inp.value);
        inp.type = 'password'
        const inp2 = document.querySelector('.boxx')
        inp2.checked = true

    </script>
</body>

</html>